That’s a really good question. Made me think.
Scott Peterson was supposedly away “fishing” when Laci went missing and he stayed in his home subscribing to playboy, etc, while search was on. I dont think he had to leave at all but could be wrong?
Fotis Dulos wasn’t living in the home Jennifer disappeared from, so that was why he wasn’t allowed there.
Patrick Frazee lived with his mom.
Beau Rothwell was allowed to stay in home even though Jennifer went missing...
So it would make sense that BM could’ve possibly been living somewhere else when SM went missing, because from all the cases I remember the spouse can’t be/won’t be kept from their home, even when a suspect, unless they weren’t currently residing there.